JP2563595B2 - Composite thin film magnetic head - Google Patents
Composite thin film magnetic headInfo
- Publication number
- JP2563595B2 JP2563595B2 JP1203258A JP20325889A JP2563595B2 JP 2563595 B2 JP2563595 B2 JP 2563595B2 JP 1203258 A JP1203258 A JP 1203258A JP 20325889 A JP20325889 A JP 20325889A JP 2563595 B2 JP2563595 B2 JP 2563595B2
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- Japan
- Prior art keywords
- magnetic layer
- upper magnetic
- recording
- thin film
- width
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Description
【発明の詳細な説明】 産業上の利用分野 本発明は、磁気記録再生装置に用いられる薄膜磁気ヘ
ッドに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin film magnetic head used in a magnetic recording / reproducing apparatus.
従来の技術 近年、磁気記録再生装置の高記録密度化、データの高
転送速度化に対応して薄膜磁気ヘッドが注目されてい
る。2. Description of the Related Art In recent years, thin film magnetic heads have attracted attention in response to higher recording densities and higher data transfer rates of magnetic recording / reproducing devices.
従来の薄膜磁気ヘッドを第４図及び第５図に示す。 A conventional thin film magnetic head is shown in FIGS.
第４図は、巻線型の薄膜磁気ヘッドであり、基板21上
に軟磁性材料からなる下部磁性層22が積層され、下部磁
性層22上に所定膜厚の絶縁層でなるギャップ層23を形成
し、さらに絶縁層24に埋め込まれるようにして導電コイ
ル25を形成し、軟磁性材料からなる上部磁性層26を形成
して構成され、記録時には導電コイル25に信号電流を印
加し、これによりギャップ部で発生する磁界により記録
媒体に記録を行い、再生時にはギャップ部から流入する
記録媒体上の信号磁界を導電コイル25により検出する。FIG. 4 shows a winding type thin film magnetic head, in which a lower magnetic layer 22 made of a soft magnetic material is laminated on a substrate 21, and a gap layer 23 made of an insulating layer having a predetermined thickness is formed on the lower magnetic layer 22. Then, the conductive coil 25 is formed so as to be embedded in the insulating layer 24, and the upper magnetic layer 26 made of a soft magnetic material is formed, and a signal current is applied to the conductive coil 25 at the time of recording, thereby forming a gap. Recording is performed on the recording medium by the magnetic field generated in the recording medium, and at the time of reproduction, the signal magnetic field on the recording medium flowing from the gap portion is detected by the conductive coil 25.
第５図は、磁気抵抗効果を利用した磁気抵抗効果型薄
膜磁気ヘッドであり、基板31上にギャップ33、前部ヨー
ク35、磁気抵抗効果素子34、後部ヨーク36、下部磁性層
32からなる磁気回路を構成し、ギャップ部から流入する
記録媒体上の信号磁界を磁気抵抗効果素子34により検出
する。FIG. 5 shows a magnetoresistive thin-film magnetic head utilizing the magnetoresistive effect, in which a gap 33, a front yoke 35, a magnetoresistive element 34, a rear yoke 36, and a lower magnetic layer are formed on a substrate 31.
A magnetic circuit composed of 32 is formed, and the signal magnetic field on the recording medium flowing from the gap portion is detected by the magnetoresistive effect element.
発明が解決しようとする課題 上記従来の巻線型の薄膜磁気ヘッドは、その再生出力
を増加させるためには巻線数を増加させるか、記録媒体
との相対速度を増加させねばならず、特に、磁気記録再
生装置の構成上、記録媒体との相対速度が小さい場合に
はさらに巻線数を増加させなければならない。この点、
磁気抵抗効果型の薄膜磁気ヘッドによる再生では、媒体
の走行速度によらず一定の再生出力が得られるため、記
録時には巻線型の薄膜磁気ヘッドを使用し、再生時には
磁気抵抗効果型の薄膜磁気ヘッドを使用する磁気記録再
生装置もある。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the conventional wound-type thin film magnetic head, in order to increase the reproduction output, the number of windings must be increased or the relative speed with the recording medium must be increased. Due to the structure of the magnetic recording / reproducing apparatus, the number of windings must be further increased when the relative speed to the recording medium is small. In this respect,
When reproducing with a magnetoresistive thin-film magnetic head, a constant reproducing output is obtained regardless of the running speed of the medium. Therefore, a winding thin-film magnetic head is used during recording and a magnetoresistive thin-film magnetic head during reproduction. There is also a magnetic recording / reproducing apparatus using.
しかしながら、記録，再生に各々専用のヘッドを用い
る際には、各々のヘッドのギャップ面を平行、かつ、ト
ラック幅方向の中心位置を一致させて磁気記録再生装置
に取り付ける必要があり、狭トラック化に対応したヘッ
ドの場合、取り付けが困難であるという問題点があっ
た。However, when dedicated heads are used for recording and reproduction, it is necessary to attach the heads to the magnetic recording / reproducing device with the gap surfaces of the heads in parallel and the center positions in the track width direction aligned with each other. In the case of the head corresponding to (1), there is a problem that it is difficult to mount.
このような問題点を解決するため、第６図に示すよう
な巻線型と磁気抵抗効果型を合わせた複合型薄膜磁気ヘ
ッドが提案されている（特開昭61−48116号公報）。し
かし、この複合型薄膜磁気ヘッドは記録時と、再生時の
トラック幅が同一で記録媒体の走行精度が悪い場合に
は、良好な記録再生を実現できない。以下、この点につ
いて説明する。In order to solve such a problem, there has been proposed a composite type thin film magnetic head as shown in FIG. 6 which is a combination of a wound type and a magnetoresistive effect type (Japanese Patent Laid-Open No. 61-48116). However, this composite thin-film magnetic head cannot achieve good recording / reproduction when the track width is the same during recording and during reproduction and the running accuracy of the recording medium is poor. Hereinafter, this point will be described.
複合型薄膜磁気ヘッドのトラック幅をT1、記録媒体の
走行精度を±ａとすると、記録時と再生時の走行ずれは
最大2aとなり、有効な再生トラック幅は（T1−2a）とな
り、再生出力が低下するという課題があった。Composite thin film of the track width of the magnetic head T 1, when the running accuracy ± a recording medium, the travel deviations during reproduction and during recording becomes maximum 2a, effective reproduction track width (T 1 -2a), and the There is a problem that the reproduction output decreases.
本発明は、上記従来の課題を解決するもので、良好な
磁気記録再生を行う複合型薄膜磁気ヘッドを提供するこ
とを目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned conventional problems and to provide a composite type thin film magnetic head that performs good magnetic recording and reproduction.
課題を解決するための手段 この目的を達成するため本発明の複合型薄膜磁気ヘッ
ドは、下部磁性層と上部磁性層と導電コイルとを備え、
前記上部磁性層は、再生トラック幅と同じ幅を有し、そ
の一部を磁気抵抗効果素子で置換した第１の上部磁性層
と、前記第１の上部磁性層のトラック幅方向の両側に位
置し、間隔をおいて形成された第２の上部磁性層と、膜
厚が前記第1,第２の上部磁性層より小さく前記第１の上
部磁性層と前記第２の上部磁性層との間隔内の少なくと
も記録媒体が接触する部分に形成された第３の上部磁性
層とから成り、前記第１の上部磁性層の幅と、前記第２
の上部磁性層の幅と、前記第３の上部磁性層の幅との和
を記録トラック幅と同じ幅にしたものである。Means for Solving the Problems To achieve this object, a composite thin-film magnetic head of the present invention comprises a lower magnetic layer, an upper magnetic layer, and a conductive coil,
The upper magnetic layer has the same width as the reproducing track width, and is located on both sides of the first upper magnetic layer in which a part thereof is replaced with a magnetoresistive effect element and the first upper magnetic layer in the track width direction. And a second upper magnetic layer formed with a gap, and a gap between the first upper magnetic layer and the second upper magnetic layer having a smaller film thickness than the first and second upper magnetic layers. A third upper magnetic layer formed in at least a portion in contact with the recording medium, the width of the first upper magnetic layer, and the second upper magnetic layer.
The width of the upper magnetic layer and the width of the third upper magnetic layer have the same width as the recording track width.
作用 上記構成により、本発明の複合型薄膜磁気ヘッドは、
記録トラック幅と再生トラック幅を異ならしめることが
可能で、これにより、記録時と、再生時の記録媒体の走
行ずれが生じても再生出力は低下しない。With the above configuration, the composite thin film magnetic head of the present invention,
It is possible to make the recording track width and the reproducing track width different from each other, so that the reproduction output does not decrease even when the recording medium travels during recording and during reproduction.
実施例 以下、本発明の第１の実施例における複合型薄膜磁気
ヘッドについて、第１図を用いて説明する。Embodiment A composite thin film magnetic head according to the first embodiment of the present invention will be described below with reference to FIG.
第１図（ａ）は、第１の実施例における複合型薄膜磁
気ヘッドの平面図、第１図（ｂ）は第１図（ａ）中のＡ
−Ａ断面図、第１図（ｃ）は同実施例における複合型薄
膜磁気ヘッドの正面図である。FIG. 1 (a) is a plan view of the composite type thin film magnetic head in the first embodiment, and FIG. 1 (b) is A in FIG. 1 (a).
FIG. 1C is a front view of the composite type thin film magnetic head in the same example.
第１の実施例における複合型薄膜磁気ヘッドは、非磁
性の基板１上に軟磁性材料から成る下部磁性層２が記録
トラック幅と同じ幅を持つように形成され、その上に絶
縁層から成るギャップ層３が形成され、そして導電コイ
ル４が形成された後、絶縁層を介して磁気抵抗素子５が
形成され、第１の上部磁性層６、第２の上部磁性層７が
形成された構造をしている。第１の上部磁性層６は磁気
抵抗効果素子５を介し、ギャップ層３、下部磁性層２に
より、導電コイル４を巻回するように磁気回路を構成
し、第２の上部磁性層７は、第１の上部磁性層６のトラ
ック幅方向の両側に間隔９をおいて形成されており、ギ
ャップ層３、下部磁性層２により、導電コイル４を巻回
するように磁気回路を構成している。In the composite thin film magnetic head in the first embodiment, a lower magnetic layer 2 made of a soft magnetic material is formed on a non-magnetic substrate 1 so as to have the same width as a recording track width, and an insulating layer is formed thereon. The structure in which the gap layer 3 is formed, the conductive coil 4 is formed, the magnetoresistive element 5 is formed through the insulating layer, and the first upper magnetic layer 6 and the second upper magnetic layer 7 are formed. Are doing The first upper magnetic layer 6 constitutes a magnetic circuit such that the conductive coil 4 is wound by the gap layer 3 and the lower magnetic layer 2 via the magnetoresistive effect element 5, and the second upper magnetic layer 7 is Spaces 9 are formed on both sides of the first upper magnetic layer 6 in the track width direction, and the gap layer 3 and the lower magnetic layer 2 constitute a magnetic circuit so as to wind the conductive coil 4. .
第３の上部磁性層８は、膜厚が第１の上部磁性層６、
第２の上部磁性層７より小さく、第１の上部磁性層６と
第２の上部磁性層７との間隔９内の第１の上部磁性層６
の記録媒体摺動面から磁気抵抗効果素子５に至る部分に
形成されている。The third upper magnetic layer 8 has a film thickness of the first upper magnetic layer 6,
The first upper magnetic layer 6 is smaller than the second upper magnetic layer 7 and within the space 9 between the first upper magnetic layer 6 and the second upper magnetic layer 7.
Is formed in a portion from the sliding surface of the recording medium to the magnetoresistive effect element 5.
さらに、磁気抵抗効果素子５は、第１の上部磁性層６
により導かれた記録媒体からの信号磁界を再生するよう
に有効領域を設定されるよう電極10が形成されている。Further, the magnetoresistive effect element 5 includes the first upper magnetic layer 6
The electrode 10 is formed so that the effective area is set so as to reproduce the signal magnetic field from the recording medium guided by.
次に、動作について説明する。記録時には、導電コイ
ル４に記録電流が印加され、これにより生じた記録磁界
は第１の上部磁性層６、下部磁性層２から成る磁気回路
と、第２の上部磁性層７、下部磁性層２からなる磁気回
路によりギャップ部に導かれ記録媒体（不図示）に記録
がなされる。そして、第３の上部磁性層８は膜厚が小さ
いため磁気抵抗は大きくなるが、記録時の信号磁界は大
きいため第３の上部磁性層８にも信号磁界が第１の上部
磁性層６、第２の上部磁性層７から流入し、第３の上部
磁性層８の部分でも記録がなされる。この時の記録パタ
ーンは幅Twであり、これは第１の上部磁性層６の幅と、
第２の上部磁性層７の幅と、第３の上部磁性層８の幅と
の和である。Next, the operation will be described. At the time of recording, a recording current is applied to the conductive coil 4, and the recording magnetic field generated by this is applied to the magnetic circuit including the first upper magnetic layer 6 and the lower magnetic layer 2 and the second upper magnetic layer 7 and the lower magnetic layer 2. Is guided to the gap portion by the magnetic circuit consisting of and recorded on a recording medium (not shown). Since the third upper magnetic layer 8 has a small film thickness, the magnetic resistance increases, but the signal magnetic field at the time of recording is large, so that the third upper magnetic layer 8 also has a signal magnetic field. Recording is performed in the portion of the third upper magnetic layer 8 which flows in from the second upper magnetic layer 7. The recording pattern at this time has a width T w , which is the width of the first upper magnetic layer 6 and
It is the sum of the width of the second upper magnetic layer 7 and the width of the third upper magnetic layer 8.
再生時には、記録媒体からの信号磁界が第１の上部磁
性層６により磁気抵抗効果素子５に導かれ、再生が行わ
れ、第１の上部磁性層６の幅が再生トラック幅TRとな
る。At the time of reproduction, the signal magnetic field from the recording medium is guided to the magnetoresistive effect element 5 by the first upper magnetic layer 6 to be reproduced, and the width of the first upper magnetic layer 6 becomes the reproduction track width T R.
記録トラック幅Twと再生トラック幅TRは、記録媒体の
走行精度を±ａとしたときTw＝TR＋2aとなるようにヘッ
ドは構成されており、記録時と再生時の記録媒体の走行
ずれが最大2aとなっても、再生トラックは記録トラック
内にあり、さらに前述したように記録トラック内は完全
に記録がなされているため、再生信号が低下することは
ない。The head is configured such that the recording track width T w and the reproducing track width T R are T w = T R + 2a when the running accuracy of the recording medium is ± a. Even if the maximum travel deviation is 2a, the reproduction track is in the recording track, and the recording track is completely recorded as described above, so that the reproduction signal does not decrease.
そして、走行ずれによって第２の上部磁性層７が隣接
トラックに侵入した場合、隣接トラックの信号磁界は第
２の上部磁性層７に流入するが、第３の上部磁性層８の
膜厚が第２の上部磁性層７より小さいため磁気抵抗が大
きく第２の上部磁性層７に流入した隣接トラックの信号
磁界は第３の上部磁性層８を介して第１の上部磁性層６
には流入しにくくなり、従って、隣接トラックの信号磁
界が磁気抵抗効果素子５に流入することがないため、ク
ロストークの小さい良好な再生が行なわれる。When the second upper magnetic layer 7 intrudes into the adjacent track due to the traveling deviation, the signal magnetic field of the adjacent track flows into the second upper magnetic layer 7, but the third upper magnetic layer 8 has a thickness of Since the magnetic field is smaller than the second upper magnetic layer 7, the magnetic field is large and the signal magnetic field of the adjacent track that has flowed into the second upper magnetic layer 7 passes through the third upper magnetic layer 8 and the first upper magnetic layer 6.
To the magnetoresistive effect element 5. Therefore, since the signal magnetic field of the adjacent track does not flow into the magnetoresistive effect element 5, good reproduction with small crosstalk is performed.
次に、第２の実施例について第２図及び第３図を用い
て説明する。第２図（ａ）は第２の実施例における複合
型薄膜磁気ヘッドの平面図、第２図（ｂ）は正面図、第
３図（ａ）は第２図のＢ−Ｂ断面図、第３図（ｂ）は第
２図のＣ−Ｃ断面図である。第２図及び第３図につい
て、第１図と同一の構成要素については同一符号を付
し、その説明を省略する。Next, a second embodiment will be described with reference to FIGS. 2 (a) is a plan view of the composite type thin film magnetic head in the second embodiment, FIG. 2 (b) is a front view, FIG. 3 (a) is a sectional view taken along line BB of FIG. FIG. 3 (b) is a sectional view taken along line CC of FIG. 2 and 3, the same components as those in Fig. 1 are designated by the same reference numerals, and the description thereof will be omitted.
第２の実施例における第２の上部磁性層17は、第１の
上部磁性層６のトラック幅方向の両側に間隔19をおいて
形成されており、磁気抵抗効果素子５が形成されている
部位と隣接する位置で第１の上部磁性層６と同様に切り
欠かれている。そして、第２の上部磁性層17、ギャップ
層３、下部磁性層２により、導電コイル４を巻回するよ
うに磁気回路を構成している。The second upper magnetic layer 17 in the second embodiment is formed at intervals 19 on both sides of the first upper magnetic layer 6 in the track width direction, and is a portion where the magnetoresistive effect element 5 is formed. Like the first upper magnetic layer 6, it is cut out at a position adjacent to. The second upper magnetic layer 17, the gap layer 3 and the lower magnetic layer 2 constitute a magnetic circuit so that the conductive coil 4 is wound.
第３の上部磁性層18は膜厚が第１の上部磁性層６、第
２の上部磁性層17より小さく、第１の上部磁性層６と第
２の上部磁性層17との間隔19内の第１の上部磁性層６の
記録媒体摺動面から磁気抵抗効果素子５に至る部分に形
成されている。The thickness of the third upper magnetic layer 18 is smaller than that of the first upper magnetic layer 6 and the second upper magnetic layer 17, and the thickness of the third upper magnetic layer 18 is within the space 19 between the first upper magnetic layer 6 and the second upper magnetic layer 17. The first upper magnetic layer 6 is formed in a portion extending from the recording medium sliding surface to the magnetoresistive effect element 5.
記録，再生時の動作については第１の実施例と同様で
あるので説明を省略する。記録時の記録パターンは幅Tw
であり、これは第１の上部磁性層６の幅と第２の上部磁
性層17の幅と第３の上部磁性層18の幅との和であり、記
録トラック幅Twと再生トラック幅TRは、記録媒体に走行
精度を±ａとしたとき、Tw＝TR＝2aとなるようにヘッド
が構成されていることは、第１の実施例と同様である。The operation at the time of recording and reproducing is the same as that of the first embodiment, and therefore its explanation is omitted. When recording, the recording pattern has a width T w
This is the sum of the width of the first upper magnetic layer 6, the width of the second upper magnetic layer 17, and the width of the third upper magnetic layer 18, and is the recording track width T w and the reproducing track width T. Similar to the first embodiment, the head is configured such that T w = T R = 2a, where R is the running accuracy of ± a on the recording medium.
そして、記録時と再生時の記録媒体の走行ずれが最大
の2aとなっても再生トラックは記録トラック内にあり、
再生信号が低下することはない。さらに、走行ずれによ
って第２の上部磁性層17が隣接トラックに侵入した場
合、隣接トラックの信号磁界は第２の上部磁性層17に流
入するが、第３の上部磁性層８の磁気抵抗が大きいた
め、信号磁界が磁気抵抗効果素子５に流入することがな
く、クロストークの小さい良好な再生が行われることは
第１の実施例と同様である。さらに、第２の上部磁性層
17は、第１の上部磁性層６と同じようにその一部を切り
欠いているため、下部磁性層２と第１の上部磁性層６か
ら成る磁気回路と、下部磁性層２と第２の上部磁性層17
とから成る磁気回路が、記録時には同様の構成となるの
で記録効率が同一で記録できるという効果を有する。Then, even if the running gap of the recording medium at the time of recording and reproduction becomes the maximum 2a, the reproduction track is in the recording track,
The reproduction signal does not decrease. Further, when the second upper magnetic layer 17 invades the adjacent track due to the traveling deviation, the signal magnetic field of the adjacent track flows into the second upper magnetic layer 17, but the magnetic resistance of the third upper magnetic layer 8 is large. Therefore, the signal magnetic field does not flow into the magnetoresistive effect element 5, and good reproduction with a small crosstalk is performed as in the first embodiment. Further, the second upper magnetic layer
Since 17 is partially cut out like the first upper magnetic layer 6, the magnetic circuit composed of the lower magnetic layer 2 and the first upper magnetic layer 6, the lower magnetic layer 2 and the second magnetic layer 2 are formed. Upper magnetic layer 17
Since the magnetic circuit consisting of and has the same structure during recording, there is an effect that recording can be performed with the same recording efficiency.
なお、第1,第２の実施例において、第３の上部磁性層
８は第１の上部磁性層６と第２の上部磁性層７との間隔
内の第１の上部磁性層６の記録媒体摺動面から磁気抵抗
効果素子５に至る部分に形成したが、第３の上部磁性層
８は少なくとも記録媒体が接触する部分に形成すれば上
述した効果が得られる。In the first and second embodiments, the third upper magnetic layer 8 is the recording medium of the first upper magnetic layer 6 within the space between the first upper magnetic layer 6 and the second upper magnetic layer 7. Although the third upper magnetic layer 8 is formed in the portion extending from the sliding surface to the magnetoresistive effect element 5, the above-described effect can be obtained if it is formed in at least the portion in contact with the recording medium.
そして、第１の上部磁性層６、第２の上部磁性層７、
第３の上部磁性層８には各々別種の磁性材料を用いても
よいが、第1,第２の実施例の第１の上部磁性層、第２の
上部磁性層、第３の上部磁性層には同一の軟磁性材料を
用いた。これにより工程を簡略化できる効果を有する。Then, the first upper magnetic layer 6, the second upper magnetic layer 7,
Different magnetic materials may be used for the third upper magnetic layer 8, but the first upper magnetic layer, the second upper magnetic layer, and the third upper magnetic layer of the first and second embodiments may be used. The same soft magnetic material was used for. This has the effect of simplifying the process.
また、第1,第２の実施例において導電コイル４をター
ン数を１ターンとしたが複数巻にして、記録電流を低下
させることも可能である。また、導電コイル４は再生時
に磁気抵抗効果素子５にバイアス効果を印加するための
コイルとしても使用している。Further, although the number of turns of the conductive coil 4 is one in the first and second embodiments, it is possible to reduce the recording current by making a plurality of turns. The conductive coil 4 is also used as a coil for applying a bias effect to the magnetoresistive effect element 5 during reproduction.
発明の効果 以上のように本発明の複合型薄膜磁気ヘッドは、下部
磁性層と上部磁性層と導電コイルとを備え、前記上部磁
性層は、再生トラック幅と同じ幅を有し、その一部を磁
気抵抗効果素子で置換した第１の上部磁性層と、前記第
１の上部磁性層のトラック幅方向の両側に位置し、間隔
をおいて形成された第２の上部磁性層と、膜厚が前記第
１の上部磁性層、前記第２の上部磁性層より小さく前記
第１の上部磁性層と前記第２の上部磁性層との間隔内の
少なくとも記録媒体が接触する部分に形成された第３の
上部磁性層とから成り、前記第１の上部磁性層の幅と、
前記第２の上部磁性層の幅と、前記第３の上部磁性層の
幅との和を記録トラック幅と同じ幅としたため、記録媒
体の走行精度を±ａとしたとき、記録時と再生時の記録
媒体の走行ずれが最大2aとなっても再生トラックは記録
トラック内にあり、かつ、第３の上部磁性層は膜厚が小
さいため磁気抵抗は大きくなるが、記録時の信号磁界は
大きいため第３の上部磁性層にも信号磁界が第１の上部
磁性層、第２の上部磁性層から流入し、第３の上部磁性
層の部分でも記録がなされるので記録トラック中では記
録が完全に行われているため、再生信号が低下すること
はない。As described above, the composite thin-film magnetic head of the present invention includes the lower magnetic layer, the upper magnetic layer, and the conductive coil, and the upper magnetic layer has the same width as the reproduction track width, and a part thereof. With a magnetoresistive effect element, and a second upper magnetic layer formed on both sides in the track width direction of the first upper magnetic layer and spaced apart from each other; Is smaller than the first upper magnetic layer and the second upper magnetic layer, and is formed in at least a portion of the gap between the first upper magnetic layer and the second upper magnetic layer where the recording medium comes into contact. And the width of the first upper magnetic layer,
Since the sum of the width of the second upper magnetic layer and the width of the third upper magnetic layer is set to be the same as the recording track width, when the running accuracy of the recording medium is ± a, during recording and during reproduction. Even if the recording medium has a maximum running deviation of 2a, the reproducing track is in the recording track, and the third upper magnetic layer has a small film thickness, so the magnetic resistance is large, but the signal magnetic field during recording is large. Therefore, the signal magnetic field also flows into the third upper magnetic layer from the first upper magnetic layer and the second upper magnetic layer, and recording is also performed in the third upper magnetic layer. Therefore, the reproduction signal does not decrease.
さらに、走行ずれによって第２の上部磁性層が隣接ト
ラックに進入した場合、隣接トラックの信号磁界は第２
の上部磁性層に流入するが、第３の上部磁性層は第２の
上部磁性層より膜厚が小さいため磁気抵抗が大きくな
り、隣接トラックの信号磁界が第３の上部磁性層を介し
て第２の上部磁性層に流入しにくく、そして磁気抵抗効
果素子に流入することがないため、クロストークの小さ
い良好な再生を行うことができる。Furthermore, when the second upper magnetic layer enters the adjacent track due to the traveling deviation, the signal magnetic field of the adjacent track is changed to the second track.
Of the third upper magnetic layer, the third upper magnetic layer has a smaller film thickness than that of the second upper magnetic layer and thus has a larger magnetic resistance, and the signal magnetic field of the adjacent track passes through the third upper magnetic layer. Since it hardly flows into the upper magnetic layer 2 and does not flow into the magnetoresistive effect element, good reproduction with small crosstalk can be performed.
そして、第２の上部磁性層の一部を切り欠くことによ
り、磁気回路の構成が第１の上部磁性層と同様となるた
め同一の効率で記録することができるという効果を有す
る。Then, by notching a part of the second upper magnetic layer, the structure of the magnetic circuit becomes similar to that of the first upper magnetic layer, so that there is an effect that recording can be performed with the same efficiency.
第１図（ａ）は本発明の第１の実施例における複合型薄
膜磁気ヘッドの平面図、第１図（ｂ）は同実施例におけ
るＡ−Ａ断面図、第１図（ｃ）は同実施例における正面
図、第２図（ａ）は本発明の第２の実施例における複合
型薄膜磁気ヘッドの平面図、第２図（ｂ）は同実施例に
おける正面図、第３図（ａ）は同実施例におけるＢ−Ｂ
断面図、第３図（ｂ）は同実施例におけるＣ−Ｃ断面
図、第４図は従来の巻線型の薄膜磁気ヘッドの断面図、
第５図は他の従来の磁気抵抗型薄膜磁気ヘッドの断面
図、第６図は他の従来の複合型薄膜磁気ヘッドの断面図
である。 １……基板、２……下部磁性層、３……ギャップ層、４
……導電コイル、５……磁気抵抗効果素子、６……第１
の上部磁性層、７……第２の上部磁性層、8,18……第３
の上部磁性層、9,19……間隔、10……電極。FIG. 1 (a) is a plan view of the composite type thin film magnetic head in the first embodiment of the present invention, FIG. 1 (b) is a sectional view taken along the line AA in the same embodiment, and FIG. 1 (c) is the same. A front view of the embodiment, FIG. 2 (a) is a plan view of a composite type thin film magnetic head in the second embodiment of the present invention, and FIG. 2 (b) is a front view of the same embodiment, and FIG. 3 (a). ) Is BB in the embodiment.
A sectional view, FIG. 3 (b) is a sectional view taken along line CC in the same embodiment, and FIG. 4 is a sectional view of a conventional wire-wound thin-film magnetic head.
FIG. 5 is a sectional view of another conventional magnetoresistive thin film magnetic head, and FIG. 6 is a sectional view of another conventional composite thin film magnetic head. 1 ... Substrate, 2 ... Lower magnetic layer, 3 ... Gap layer, 4
... Conductive coil, 5 ... Magnetoresistive effect element, 6 ... First
Upper magnetic layer, 7 ... second upper magnetic layer, 8,18 ... third
Upper magnetic layer, 9,19 …… spacing, 10 …… electrode.
Claims (3)
備えた薄膜磁気ヘッドであって、 前記上部磁性層は、再生トラック幅と同じ幅を有し、そ
の一部を磁気抵抗効果素子で置換した第１の上部磁性層
と、 前記第１の上部磁性層のトラック幅方向の両側に位置
し、間隔をおいて形成された第２の上部磁性層と、 膜厚が前記第1,第２の上部磁性層より小さく、前記第１
の上部磁性層と前記第２の上部磁性層との間隔内の少な
くとも記録媒体が接触する部分に形成された第３の上部
磁性層とから成り、 前記第１の上部磁性層の幅と、前記第２の上部磁性層の
幅と、前記第３の上部磁性層の幅との和を記録トラック
幅と同じ幅にしたことを特徴とする複合型薄膜磁気ヘッ
ド。1. A thin film magnetic head comprising a lower magnetic layer, an upper magnetic layer and a conductive coil, wherein the upper magnetic layer has the same width as a reproducing track width, and a part of the magnetoresistive effect element. The first upper magnetic layer replaced with, and the second upper magnetic layers formed on both sides of the first upper magnetic layer in the track width direction and spaced apart from each other; Smaller than the second upper magnetic layer,
The upper magnetic layer and the second upper magnetic layer, and at least a third upper magnetic layer formed in a portion in contact with the recording medium in the space between the second upper magnetic layer, the width of the first upper magnetic layer, and A composite thin film magnetic head characterized in that the sum of the width of the second upper magnetic layer and the width of the third upper magnetic layer is set to be the same as the recording track width.
抗効果素子で置換された部位と同じ場所で前記第２の上
部磁性層を切り欠いたことを特徴とする請求項１記載の
複合型薄膜磁気ヘッド。2. The second upper magnetic layer is cut out at the same position where a part of the first upper magnetic layer is replaced by the magnetoresistive effect element. Composite thin film magnetic head.
磁性材料としたことを特徴とする請求項１または２記載
の複合型薄膜磁気ヘッド。3. The composite thin film magnetic head according to claim 1, wherein the first, second and third upper magnetic layers are made of the same soft magnetic material.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1203258A JP2563595B2 (en) | 1989-08-04 | 1989-08-04 | Composite thin film magnetic head |
| KR1019900011601A KR940004989B1 (en) | 1989-08-04 | 1990-07-30 | Thin film magnetic head |
| US07/559,067 US5097372A (en) | 1989-08-04 | 1990-07-30 | Thin film magnetic head with wide recording area and narrow reproducing area |
| EP90308445A EP0411914B1 (en) | 1989-08-04 | 1990-07-31 | Thin film magnetic head |
| DE69025820T DE69025820T2 (en) | 1989-08-04 | 1990-07-31 | Thin film magnetic head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1203258A JP2563595B2 (en) | 1989-08-04 | 1989-08-04 | Composite thin film magnetic head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0366013A JPH0366013A (en) | 1991-03-20 |
| JP2563595B2 true JP2563595B2 (en) | 1996-12-11 |
Family
ID=16471050
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1203258A Expired - Fee Related JP2563595B2 (en) | 1989-08-04 | 1989-08-04 | Composite thin film magnetic head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2563595B2 (en) |
-
1989
- 1989-08-04 JP JP1203258A patent/JP2563595B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0366013A (en) | 1991-03-20 |
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| LAPS | Cancellation because of no payment of annual fees |